\documentclass[letterpaper,10pt]{article}
\usepackage{graphicx}
\begin{document}

\begin{figure}
    \centering
    \includegraphics[scale=1]{iter.1.mps}
    \caption{md.1.mps}
\end{figure}

\begin{figure}
    \centering
    \includegraphics[scale=1]{joux.1.mps}
    \caption{joux.1.mps}
\end{figure}

\begin{figure}
    \centering
    \includegraphics[scale=1]{joux.2.mps}
    \caption{joux.2.mps}
\end{figure}

\begin{figure}
    \centering
    \includegraphics[scale=1]{expand.1.mps}
    \caption{expand.1.mps}
\end{figure}

\begin{figure}
    \centering
    \includegraphics[scale=1]{expand.2.mps}
    \caption{expand.2.mps}
\end{figure}

\begin{figure}
    \centering
    \includegraphics[scale=1]{expand.3.mps}
    \caption{expand.3.mps}
\end{figure}

\begin{figure}
    \centering
    \includegraphics[scale=1]{expand.4.mps}
    \caption{expand.4.mps}
\end{figure}

\begin{figure}
    \centering
    \includegraphics[scale=1]{expand.5.mps}
    \caption{expand.5.mps}
\end{figure}

\begin{figure}
    \centering
    \includegraphics[scale=1]{nostradamus.1.mps}
    \caption{nostradamus.1.mps}
\end{figure}

\end{document}
